Patent Number: 6,253,265

Title: Reinitialization circuit for a data communications interface

Abstract: A method and apparatus for reinitializing a galvanically isolated bus by clearing the bus when it is locked up. The reinitialization circuit monitors the state of the bus and recognizes when the bus is locked up in an artificial active state by timing the duration of this state. When the bus has been in an active state beyond a specified threshold time, the reinitialization circuit drives a selected set of bus lines to an idle or ground state. In another embodiment, a comparator detects any desynchronized condition across the bus interface. In one representative embodiment, the circuit may be incorporated into a bus connecting a link layer device to a physical layer device that is in communication with an IEEE 1394 interface.

Inventors: Schwan; Martin A. K. (Chicago, IL)

Assignee: 3Com Corporation

International Classification: G06F 13/40 (20060101); G06F 013/00 ()

Expiration Date: 06/26/2018